XML Experts in Germany

• As part of the project, the further development of the identity management system was driven forward. This included a comprehensive refactoring of the interfaces to the connected target systems. In addition, several special systems were successfully connected to the IAM to ensure end-to-end identity and authorization management.
• Technical design and solution proposals for IAM system development
• Requirements analysis and requirements management (IREB, BABOK)
• Alignment of the strategy with the future target architecture (TOGAF)
• Prototyping of solutions
• Documentation of requirements (Innovator)
• Analysis and documentation of requirements and creation of process models (UML, BPMN, ArchiMate)
• Modeling of requirements and system functionalities (OOA/OOD, UML)
• Further development of interfaces (SOAP, REST)
• Carrying out architecture reviews

Developed a CPU monitoring application using Spring Boot and React, containerized with Docker Compose, with automated infrastructure provisioning using Terraform on AWS.

Stack: Spring Boot, React, PostgreSQL, REST API, Docker Compose, Terraform, AWS

AI telephone assistant platform

Claude Code, Google AI Studio, Python, LLM / Voice-AI, PostgreSQL

• Conception and hands-on development of an AI-supported telephone assistant platform (voice AI / LLM) – from idea and architecture to MVP/product.
• Built agentic workflows and full automations with Claude Code and Google AI Studio.
• Also delivered AI-supported work in client engagements: used Claude Code for governance documentation, requirement drafts, and automations.

Subproject management in an agile IT environment

Leading a software development team (10 employees)

• Leading a software development team with 10 employees
• Budget responsibility approx. 3 million Euros per year
• Conducting employee and job interviews
• Responsibility for resource planning (budget and employees)
• Digitalization of a web interface
• Regular reporting to clients and stakeholders (C-level)
• Product management: developing and implementing product strategies; defining requirements to steer product development
• Designing product development & continuous testing efficiently to quickly incorporate feedback & compliance points
• Close collaboration with stakeholders & various teams to understand requirements, define priorities, ensure rollout, and increase user-friendliness
• Project experience in an energy industry company, including the functioning of energy markets, the basics of energy generation and distribution, as well as current challenges and developments in the industry
• Project experience in the railway sector - including the structure and operation of railway systems.
• Project experience within the 16.7 Hz traction power sector including knowledge of regulatory processes
• Formulating the subproject charter and the project profile according to the project standard together with the project management
• Steering performance delivery according to the project charter
• Planning and steering human resources including budget planning for the subproject
• Ensuring the working capacity of subproject participants, e.g., by requesting access rights and documents for the subproject team
• Planning and steering for the respective subproject (Time, Scope, Budget) including the creation of necessary documents
• Coordinating with the department and Product Owners to plan the subproject scope and the corresponding implications
• Conducting milestone planning according to the agreed process model
• Effort estimation and support of subproject controlling as well as overall project controlling in forecasting and planning
• Reporting subproject status (according to status slide template) including progress (according to progress measurement)
• Analyzing, preparing, and addressing needs for action and decisions
• Escalating subproject issues to project management
• Creating and managing Change Requests (CR)
• Quality assessment of completed task packages from a project management perspective (Time, Scope, and Budget)
• Steering the implementation of cross-cutting specifications and requirements in the subproject, supported by cross-functional roles on the business and technical side.
• Identifying, steering, documenting, and communicating opportunities, risks, and dependencies within and across subprojects
• Supporting project management in creating the overall project plan and overall status reports
• Preparing and steering commissioning including required documents and protection requirements assessment

Scrum Master in an agile IT environment supporting a software development team in the fullstack area (7 people)

• Close collaboration with stakeholders & various teams to understand requirements, define priorities, ensure rollout, and increase user-friendliness
• Introducing the selected Scrum method, including the required events, meetings, artifacts (Product Backlog, Sprint Backlog, Burndown Charts), metrics, and conducting required training in an agile IT environment
• Preparing Scrum events such as Daily, Retrospectives, Review, Sprint Planning, Estimation, and Refinement (agile way of working)
• Facilitating retrospectives and removing impediments to drive the team and product forward
• Preparing action points and retros via Whiteboard and Figma
• Applying and improving agile methods such as Kanban, Scrum, SAFe, or Scrum of Scrums
• Tracking the "Definition of Done" and "Definition of Ready" for all work results of the development team
• Advising on information flow and communication improvements between Product Owner and project team
• Experience with automation, validation such as mandatory field checks, notification functions, creating filters, boards, and reports via JQL, and setting up Cycle Time
• Using Jira & Confluence
• Setting up progress measurement for project management to transparently map planned vs. actual team capacities and actual effort for user stories
• Measuring team progress: creating team KPIs: "Velocity", "Burn-Down Chart", "Throughput", "Costs", "Quality", "Scope"
• Evaluating agile metrics, process management, and process modeling methods (BPMN, EPC, UML)
• Communication and moderation know-how
• Proven methodological competence in conflict resolution discussions

• Mendix low-code development / project management
• Managing external resources
• Customer and user management, roles
• Master data entry
• Quote preparation
• Material costing
• Workflows
• Basic CRM functions
• API interfaces (email, SMS, AI chatbot)
• PDF API (.NET development using Aspose.PDF)
• Stakeholder management (dev teams, enorin team, test client)
• Risk management (backend access & sizing, role concepts)
• Testing and staff training
• Creating epics and stories in Confluence
• Jira Scrum planning and management

• Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
• Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
• Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
• Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
• Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
• Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
• Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
• Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
• Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.

Project goal: Carrying out system tests and validating industrial communication and control systems, including requirements definition and verification.

Responsibilities:

• Test planning, test execution
• Test strategy, test cases, and test specifications
• Requirements analysis
• Ensuring traceability between requirements, test cases, and defects
• Carrying out regression and integration tests
• Defect analysis
• Simulation and validation
• NetSniffer Wireshark
• Supporting test automation (Python, CI/CD)
• Reporting
• Stakeholder coordination and agile collaboration (Scrum / SAFe / Kanban)
• V-Model
• CI/CD automation with Python, Groovy, and frameworks (Selenium, PyTest)

Technologies:: CAN, Modbus, Ethernet, PLC, PROFINET, Codebeamer ALM, Scrum, SAFe, MS Teams, Git, CI/CD with GitLab CI and TeamCity, Windows Batch, FAS, Wireshark, Python, Enterprise Architect (EA), AI tools (e.g. ChatGPT, Microsoft Copilot), VS Code, Tia Portal, SCL, Python (Selenium, PyTest)

• Building a data integration platform for high, medium, and low voltage assets for contextual analysis of time series with master data from the SCADA control system (IEC 60870 104), INIS, and SAP.
• Responsibility for the architecture and implementation of the solution, as well as sparring partner for the Product Owner.
• Use of Kotlin, Spring Boot, Maven, TimescaleDB, PostgreSQL, liquibase, Elements IoT, Docker, Kubernetes, Grafana, Python, jupyter, and various API gateways.

• WiNOWiG extensions (digitalization & organization)
• Project management for the WiNOWiG project (regulatory offenses)
• Process optimization and coordination

Concept and implementation of a unified-commerce platform for SMEs for selling and building multi-product bundles

Successes: On-time concept, delivery, and customer acceptance of a 100% functional, CPQ-based buy flow process for configuring and selling multi-product bundles within the given 90-day time frame. Successfully tested integration of various interface services for the following areas: customer search, customer data enrichment, address validation, service qualification, phone number validation, credit check, appointment selection, and quote-to-order transition.

Responsibilities:

• Strategic target delivery: deriving and implementing strategic customer goals (e.g. release content, business value).
• Backlog management: creating and refining backlog items (initiatives, epics, user stories, defects) in close coordination with the project team and customer.
• Prioritization & releases: responsibility for prioritizing the product backlog and delivering defined release goals.
• Deliverable tracking: tracking work results on both the supplier and customer side.
• Roadmap & release planning: developing and implementing roadmaps and release plans together with the customer.
• Scope responsibility: responsibility for the contractually agreed scope of services.
• Claim management: active claim and change management toward the customer.
• Team coordination: steering and coordinating the development team.
• Using synergies: making use of synergies between customer projects and product development.
• Offer preparation: preparing offers (with supervision) and presenting them on site to customers and partners.

Skills: development, communication, and implementation of product visions; product backlog management; stakeholder management; regular reporting to management and steering committees; requirements analysis & engineering; planning and documenting workshops; functional leadership and coordination of (distributed) project teams and external service providers; epic management; user story specifications; creating use cases, support with software tests and user acceptance testing (UAT); release management and sprint planning; design of target processes; process optimization; planning, concept, and specification of interfaces to existing and new systems; identification, assessment, and steering of project risks; active claim and change management; facilitation of sprint planning and reviews; data migration; Scrum; Kanban; REST API; JSON; XML; BPMN; UML; Jira; Confluence

• Planning and implementation of a migration strategy for master and transaction data for the continuous loading of a cloud-independent database
• Creation and pilot implementation of a company-wide Business Data Model for customers, suppliers, contracts, products, prices, consumption, invoices, and dunning
• Concept and consulting for a Data Governance Framework incl. definition of committees, roles, processes, and metadata model
• Operationalization of the Data Governance Framework with definition of data standards
• Sub-project management in two pilot projects (PoCs) for Data Governance systems (ErwinDIS and Atlan)
• Training and coaching the data team in migration, data quality, and data modeling

• Development of scalable backend applications with C#/.NET and Java
• Design and implementation of distributed microservice architectures
• Development and integration of REST APIs for industrial applications
• Development of modern web applications with React, Angular, and TypeScript
• Implementation of MQTT-based communication solutions
• Integration of industrial protocols such as OPC UA and Modbus TCP
• Development of batch, process control, and HMI components
• Containerization and deployment of applications with Docker
• Conducting code reviews and supporting architecture decisions
• Close collaboration with product owners, QA, and interdisciplinary teams
• Analysis of business requirements and implementation of technical solutions
• Further development of existing software architectures with a focus on maintainability and performance

Technologies: C#, .NET, ASP.NET Core, Java, C++, React, Angular, TypeScript, Vue.JS, MQTT, OPC UA, Modbus TCP, Docker, GitLab, MariaDB, MySQL, Linux

I am an experienced data engineer specializing in end‑to‑end data integration, cloud DWH architectures, and high‑quality, governed data products.

I delivered following projects and engagements as a freelancer.

• Data Migration of CRM System for AL-FA Objekt Service Gmbh
• Microsoft Software Resales Partnership

I am looking for freelance roles like: Freelance Data Engineer Cloud Data Warehouse Architect Data Modeling & Architecture Consultant MDM & Data Governance Specialist BI & Analytics Developer

Technical Focus Areas

• Data Engineering & Integration: SQL Server/SSIS, Informatica PowerCenter/IDQ, Talend, Kafka, Azure Data Factory – Delta/CDC/ELT patterns, robust pipelines, monitoring/recovery, data lineage & impact analysis, medallion architecture Bronze/Silver/Gold layers
• DWH & Cloud: Azure SQL / Data Lake / Synapse, AWS Redshift/S3, on‑prem SQL/Oracle – scalable data marts with a strong cost/benefit focus.
• Data Modeling: Atomic (Inmon) and Dimensional (Kimball), Data Vault (Linstedt), Domain‑Driven Design, clear lineage & contracts.
• MDM & Governance: Informatica MDM, IBM MDM, stewardship processes, data quality rules, survivorship/XREF, catalog/glossary, SIF/BES/REST publication.
• Analytics/BI: Power BI, SSAS, Cognos – business‑ready, maintainable data products.

• Ride-sharing and bus platform, live and working. Backend Spring Boot 4.1 on Java 21, PostgreSQL with Flyway, Testcontainers integration tests. Running in my own AWS account (ECS Fargate, ALB, ECR, IAM least privilege) with CI/CD via GitHub Actions and OIDC federation without static credentials. Development throughout AI-assisted with Claude Code, including my own skills and project-specific memory. Spring Boot · Java 21 · PostgreSQL · Flyway · Docker · AWS ECS/ALB/ECR · CI/CD · GitHub Actions · Claude Code